Muscles of the Arm Flashcards
Is ulna or radius more medial?
Ulna
Movements of the forearm at the elbow
Extension
Flexion
Movements of the forearm between radius and ulna
Pronation
Supination
Which spinal nerves form the brachial plexus?
C5, 6, 7, 8 and T1
5 terminal nerves
Musculocutaneous Median Radial Ulnar Axillary
Which 3 terminal nerves form the M?
Muculocutanous
Median
Ulnar
Which 2 terminal nerves branch from the posterior cord?
Axillary
Radial
Which 2 terminal nerves have branches from all 5 spinal nerves?
Median and Radial
Pectoralis major functions
Flexion Extension Adduction Medial rotation of the ARM
Pectoralis minor function
Protracts and depresses scapula
Biceps brachii (attachments, functions)
Long head attaches glenoid fossa and radius
Short head attaches coracoid process and radius
Flexes arm
Flexes and supinates forearm
Coracobrachialis function
Flexes arm
Crosses shoulder joint
Brachialis function
Flexes forearm
Crosses elbow joint and attaches to ulna
Which terminal nerve innervates the muscles in the anterior compartment of the arm?
Musculocutaneous nerve
Triceps brachii (attachments, functions)
Long head attaches glenoid fossa and ulna
Medial (deep) and lateral head attach humeral shaft and ulna (do not cross the shoulder joint)
All 3 heads extend forearm
Long head extends arm
What terminal nerve innervates the triceps?
Radial nerve
Blood supply of the upper limb
Subclavian artery -passes first rib-> axillary artery –> brachial artery –> radial and ulnar artery
3 cords of the brachial plexus
Lateral
Medial
Posterior
Refers to relative position to axillary artery
Hitting what nerve is the “hitting one’s funny bone” feeling?
Ulnar nerve
As it crosses the elbow posteriorly
What spinal nerves contribute to 1. Lateral 2. Medial 3. Posterior cords?
- C5, C6, C7
- C8 and T1
- C5 to T1
What spinal nerves contribute to:
- Axillary nerve
- Musculocutaneous nerve
- Median nerve
- Radial nerve
- Ulnar nerve
- C5, C6
- C5, C6, C7
- C5-T1
- C5-T1
- [C7], C8, T1
Which muscle is pierced by the musculocutaneous nerve as it enters the arm?
Coracobrachialis
Where does the ulnar nerve cross the elbow?
Posterior surface
In a groove on the medial epicondyle of the humerus
Axillary nerve supplies… (2)
Teres minor
Deltoid
3 heads of the triceps brachii
Long head
Medial (deep) head
Lateral head
